<!doctype html>
<html>
	<head>
		<meta charset="utf-8">
		<title>节日快乐</title>

		<style>
			body {
				overflow: hidden;
				margin: 0;
			}

			h1 {
				position: fixed;
				top: 50%;
				left: 0;
				width: 100%;
				text-align: center;
				transform: translateY(-50%);
				font-family: 'Love Ya Like A Sister', cursive;
				font-size: 40px;
				color: #c70012;
				padding: 0 20px;
			}

			h2 {
				position: fixed;
				top: 10%;
				left: 0;
				width: 100%;
				text-align: center;
				transform: translateY(-50%);
				font-family: 'Love Ya Like A Sister', cursive;
				font-size: 20px;
				color: #c70012;
				padding: 0 20px;
			}

			@media (min-width:1200px) {
				h1 {
					font-size: 60px;
				}
			}
			
			.qr{
				color: #c70012;
			}
		</style>

	</head>
	<body>
		<script src="/demos/googlegg.js"></script>

		<canvas></canvas>
		<h1><span></span><span class="qr">节日</span>快乐！嘻嘻</h1>
		

		<script>
			var canvas = document.querySelector("canvas"),
				ctx = canvas.getContext("2d");

			var ww, wh;

			function onResize() {
				ww = canvas.width = window.innerWidth;
				wh = canvas.height = window.innerHeight;
			}

			ctx.strokeStyle = "red";
			ctx.shadowBlur = 25;
			ctx.shadowColor = "hsla(0, 100%, 60%,0.5)";

			var precision = 100;
			var hearts = [];
			var mouseMoved = false;

			function onMove(e) {
				mouseMoved = true;
				if (e.type === "touchmove") {
					hearts.push(new Heart(e.touches[0].clientX, e.touches[0].clientY));
					hearts.push(new Heart(e.touches[0].clientX, e.touches[0].clientY));
				} else {
					hearts.push(new Heart(e.clientX, e.clientY));
					hearts.push(new Heart(e.clientX, e.clientY));
				}
			}

			var Heart = function(x, y) {
				this.x = x || Math.random() * ww;
				this.y = y || Math.random() * wh;
				this.size = Math.random() * 2 + 1;
				this.shadowBlur = Math.random() * 10;
				this.speedX = (Math.random() + 0.2 - 0.6) * 8;
				this.speedY = (Math.random() + 0.2 - 0.6) * 8;
				this.speedSize = Math.random() * 0.05 + 0.01;
				this.opacity = 1;
				this.vertices = [];
				for (var i = 0; i < precision; i++) {
					var step = (i / precision - 0.5) * (Math.PI * 2);
					var vector = {
						x: (15 * Math.pow(Math.sin(step), 3)),
						y: -(13 * Math.cos(step) - 5 * Math.cos(2 * step) - 2 * Math.cos(3 * step) - Math.cos(4 * step))
					}
					this.vertices.push(vector);
				}
			}

			Heart.prototype.draw = function() {
				this.size -= this.speedSize;
				this.x += this.speedX;
				this.y += this.speedY;
				ctx.save();
				ctx.translate(-1000, this.y);
				ctx.scale(this.size, this.size);
				ctx.beginPath();
				for (var i = 0; i < precision; i++) {
					var vector = this.vertices[i];
					ctx.lineTo(vector.x, vector.y);
				}
				ctx.globalAlpha = this.size;
				ctx.shadowBlur = Math.round((3 - this.size) * 10);
				ctx.shadowColor = "hsla(0, 100%, 60%,0.5)";
				ctx.shadowOffsetX = this.x + 1000;
				ctx.globalCompositeOperation = "screen"
				ctx.closePath();
				ctx.fill()
				ctx.restore();
			};


			function render(a) {
				requestAnimationFrame(render);

				hearts.push(new Heart())
				ctx.clearRect(0, 0, ww, wh);
				for (var i = 0; i < hearts.length; i++) {
					hearts[i].draw();
					if (hearts[i].size <= 0) {
						hearts.splice(i, 1);
						i--;
					}
				}
			}


			onResize();
			window.addEventListener("mousemove", onMove);
			window.addEventListener("touchmove", onMove);
			window.addEventListener("resize", onResize);
			requestAnimationFrame(render);
		</script>

	</body>
</html>
